iwlwifi: mvm: change the iwl_mvm_d3_iface_iterator into a generic function

Getting the BSS station vif is something that may be needed by other
parts of the code.  So, instead of having an iterator specifically for
d3, change it into a generic one in utils.c.  Additionally, add a
iwl_mvm_get_bss_vif() function to make it easier to retrieving it.

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/d3.c b/drivers/net/wireless/iwlwifi/mvm/d3.c
index 0b3295e..3bbb511 100644
--- a/drivers/net/wireless/iwlwifi/mvm/d3.c
+++ b/drivers/net/wireless/iwlwifi/mvm/d3.c
@@ -601,29 +601,6 @@
 	return ret;
 }
 
-struct iwl_d3_iter_data {
-	struct iwl_mvm *mvm;
-	struct ieee80211_vif *vif;
-	bool error;
-};
-
-static void iwl_mvm_d3_iface_iterator(void *_data, u8 *mac,
-				      struct ieee80211_vif *vif)
-{
-	struct iwl_d3_iter_data *data = _data;
-
-	if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
-		return;
-
-	if (data->vif) {
-		IWL_ERR(data->mvm, "More than one managed interface active!\n");
-		data->error = true;
-		return;
-	}
-
-	data->vif = vif;
-}
-
 static int iwl_mvm_d3_reprogram(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 				struct ieee80211_sta *ap_sta)
 {
@@ -990,9 +967,6 @@
 			     bool test)
 {
 	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
-	struct iwl_d3_iter_data suspend_iter_data = {
-		.mvm = mvm,
-	};
 	struct ieee80211_vif *vif = NULL;
 	struct iwl_mvm_vif *mvmvif = NULL;
 	struct ieee80211_sta *ap_sta = NULL;
@@ -1025,17 +999,12 @@
 
 	mutex_lock(&mvm->mutex);
 
-	/* see if there's only a single BSS vif */
-	ieee80211_iterate_active_interfaces_atomic(
-		mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
-		iwl_mvm_d3_iface_iterator, &suspend_iter_data);
-
-	if (suspend_iter_data.error || !suspend_iter_data.vif) {
+	vif = iwl_mvm_get_bss_vif(mvm);
+	if (IS_ERR_OR_NULL(vif)) {
 		ret = 1;
 		goto out_noreset;
 	}
 
-	vif = suspend_iter_data.vif;
 	mvmvif = iwl_mvm_vif_from_mac80211(vif);
 
 	/* if we're associated, this is wowlan */
@@ -1639,9 +1608,6 @@
 
 static int __iwl_mvm_resume(struct iwl_mvm *mvm, bool test)
 {
-	struct iwl_d3_iter_data resume_iter_data = {
-		.mvm = mvm,
-	};
 	struct ieee80211_vif *vif = NULL;
 	int ret;
 	enum iwl_d3_status d3_status;
@@ -1650,15 +1616,10 @@
 	mutex_lock(&mvm->mutex);
 
 	/* get the BSS vif pointer again */
-	ieee80211_iterate_active_interfaces_atomic(
-		mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
-		iwl_mvm_d3_iface_iterator, &resume_iter_data);
-
-	if (WARN_ON(resume_iter_data.error || !resume_iter_data.vif))
+	vif = iwl_mvm_get_bss_vif(mvm);
+	if (IS_ERR_OR_NULL(vif))
 		goto out_unlock;
 
-	vif = resume_iter_data.vif;
-
 	ret = iwl_trans_d3_resume(mvm->trans, &d3_status, test);
 	if (ret)
 		goto out_unlock;